Features 20% less weight than other products. Small and lightweight, it is convenient to carry without being bulky. Light weight reduces the burden on impact wrenches. The insert is thin enough to not decrease durability, and the thin construction makes it lightweight and easy to carry, and reduces the burden on impact wrenches. Barker treatment on the surface for durability Design Registration No. 1559087 Specifications: For impact wrenches, semi-long type; Insertion angle: 0.5 inch (12.7 mm) (1/2), 12 square type; L: 3.1 inches (80 mm), D1.0 inches (55.7 mm), D2.1 inches (29 mm), W(g): 470